Seedance 2.5 Edit

Seedance 2.5 Edit (AI Video Editing)

What is Seedance 2.5 Edit?

Seedance 2.5 Edit, from ByteDance Seed, is an AI video editor that changes a clip you already have from a single text instruction. Hand it a source video and say what to change — replace the subject, remove a sign, repaint the sky, change the music — and the model rewrites only that, leaving the camera, motion, timing, background and everything you did not mention exactly as they were. It is the editing member of the Seedance 2.5 audio-video family, built for reference-controlled, instruction-driven work rather than generating a clip from scratch.

Key Features

• •Instruction editing: replace the subject, add or remove objects, redraw part of the frame, or change the audio in plain language.
• •Everything else stays: the model preserves whatever the prompt does not name, which makes clean before-and-after edits read instantly.
• •Reference control: supply up to 30 reference images (cited as @Image 1) plus reference audio to keep an edited subject or style consistent.
• •Source-matched output: the result keeps the source clip's aspect ratio and full length (4–30 seconds).
• •Resolution and audio: 480p, 720p or 1080p at 24 fps (10-bit colour at 1080p), with native audio you can keep, generate or edit.

Best Use Cases

Swap a product, prop or character in approved footage without re-shooting; remove an unwanted element; restyle a setting or wardrobe to match a reference image; or replace a soundtrack while keeping dialogue. Because the original motion and camera survive the edit, it suits iterating on a locked shot and preparing a clip for a continuation with Seedance 2.5 Extend. Animated, stylised, product and landscape footage work best.

Prompt Tips and Output Quality

Name one change per prompt and say what to preserve, for example: replace the tin robot with a plush teddy bear, keeping its motion, the bench and the lighting. Cite the clip as @Video 1 and references as @Image 1. In testing, a 720p edit kept the source's exact shape and length and swapped the subject cleanly while motion, background and lighting stayed put. Real human faces in the source are declined, so choose non-human subjects.

How to use Seedance 2.5 Edit

Seedance 2.5 Edit transforms a clip you already have. Upload a source video, then write a prompt that names a single change — add, remove, replace or change something, or edit the audio. Everything you do not mention is preserved, so keep the instruction tight and say what should stay.

Writing the prompt

Refer to the source as @Video 1 and any references as @Image 1 or @Audio 1. State one edit and its constraints, for example: replace the red car in @Video 1 with a blue pickup, keeping the road, traffic and camera unchanged. If your prompt names no explicit edit, "Edit @Video 1:" is prepended automatically. Supply up to 30 reference images for character or style consistency.

Recommended settings

• •video (required): a 4–30 s clip, mp4 or mov, 480p–4k, up to 200 MB. Real human faces are refused, so use animated, stylised, product or landscape footage.
• •prompt (required): one named change plus what to preserve.
• •resolution: 480p for drafts, 720p for finals, 1080p for highest fidelity (10-bit colour).
• •generate_audio: true keeps or edits the soundtrack; false delivers a silent clip.
• •reference_images / reference_audios: optional, for subject and style consistency.

The default example — replacing a wind-up tin robot with a plush teddy bear while the bench, blocks, lighting and marching motion stayed identical — ran cleanly at 720p and kept the source's 16:9 shape and 5-second length.

What this model does not control

There is no duration and no aspect_ratio field: the output always inherits the source clip's length and shape, and both are rejected if sent. Rendering is always at native resolution — to enlarge a result, pass it through segmind-video-upscaler. A region field is not accepted. Note that an edit is billed for the source clip as well as the output, so it costs about twice a plain generation of the same length — favour 480p while iterating and move to 720p or 1080p for the final pass.

Examples to try

Each example below ran end to end at the settings shown, and every edit kept the source clip's 16:9 shape, its ~5-second length, the robot's marching motion and the native soundtrack — only the thing named in the prompt changed.

• •Replace the subject. Prompt: "Replace the tin toy robot in @Video 1 with a soft plush teddy bear of the same size, keeping its exact marching motion, the workshop bench, the colourful building blocks and the lighting unchanged." The tin robot becomes a plush teddy bear that walks with the same gait while the bench, blocks and light stay put. Name what must stay so the edit touches only the subject.
• •Add an object. Prompt: "Add a small red wind-up toy train rolling across the front edge of the workshop bench in @Video 1, keeping the marching tin toy robot, the colourful building blocks and the lighting exactly as they are." A red toy train appears in the foreground while the robot keeps marching and nothing else moves. Use "add" to introduce something new, "replace" to swap what is already there.

Reference-guided edits

Seedance 2.5 Edit accepts up to 30 reference images for character or style, each cited in order as @Image 1, @Image 2, and so on. Give a clean, single-subject reference on a plain background.

• •Match a reference design. Prompt: "Restyle the marching tin toy robot in @Video 1 to match the ornate brass clockwork robot in @Image 1 — brass panels, exposed gears and a glass dome head — keeping its exact marching motion, the workshop bench, the colourful building blocks and the lighting unchanged." The robot takes on the brass, riveted, gear-filled look of the reference while its stride and the room are untouched. One sharp reference carries a look further than adjectives alone.

Further edits to try: "Remove the building blocks from the bench, leaving everything else as it is", "Change the soundtrack to a soft music-box melody", "Repaint the wall a deep teal, keeping the robot and blocks unchanged".

Can it edit a video of a real person?

No — real human faces in the source are refused; use animated, stylised, product or landscape footage.

Can I change the length or aspect ratio?

No — the output always matches the source clip's length and shape.

Does it keep the original audio?

Yes, unless you turn audio off or ask to change it in the prompt.

How many references can I use?

Up to 30 reference images, cited as @Image 1, plus reference audio.

What resolutions are supported?

480p, 720p and 1080p at 24 fps.